* Use sentence case for endpoints
* add search endpoint
* add link to search in API intro
* rename `/chat` to `/assistant`
* make it more clear which keys are for which endpoints
* remove redundant security
* Refactor API endpoint to generate assistant messages with updated request and response structures
* Add Mintlify documentation and update API reference for assistant message generation
* Update OpenAPI specification for assistant message generation with new request structure and additional properties
* Add default values for threadId and messages in assistant message generation
* Add back the create topic and generate message pages